/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.engineconnplugin.flink.client.sql.operation.impl;

import org.apache.linkis.engineconnplugin.flink.client.context.ExecutionContext;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.NonJobOperation;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.OperationUtil;
import org.apache.linkis.engineconnplugin.flink.client.sql.operation.result.ResultSet;
import org.apache.linkis.engineconnplugin.flink.context.FlinkEngineConnContext;
import org.apache.linkis.engineconnplugin.flink.exception.SqlExecutionException;

import org.apache.flink.table.api.TableEnvironment;
import org.apache.flink.table.catalog.exceptions.CatalogException;

/** Operation for USE DATABASE command. */
public class UseDatabaseOperation implements NonJobOperation {
    private final ExecutionContext context;
    private final String databaseName;

    public UseDatabaseOperation(FlinkEngineConnContext context, String databaseName) {
        this.context = context.getExecutionContext();
        this.databaseName = databaseName;
    }

    @Override
    public ResultSet execute() throws SqlExecutionException {
        final TableEnvironment tableEnv = context.getTableEnvironment();
        try {
            context.wrapClassLoader(
                    () -> {
                        // Rely on TableEnvironment/CatalogManager to validate input
                        tableEnv.useDatabase(databaseName);
                        return null;
                    });
        } catch (CatalogException e) {
            throw new SqlExecutionException("Failed to switch to database " + databaseName, e);
        }
        return OperationUtil.OK;
    }
}
